The star – who spent ­yesterday shopping in Harrods – exploded after a fortnight from hell on the UK leg of his world tour.

He was late at his 02 concert on Monday then landed in ­hospital on Thursday with breathing problems after ­collapsing on stage. On Friday, a minder had to manhandle him into his car outside his hotel as the star tried to grab a ­photographer’s camera.

We can reveal Bieber’s bizarre behaviour at the O2 led to two members of his team quitting.

Technical problems were blamed for him keeping fans waiting for nearly two hours.

But a backstage source said: “Justin was acting like such a diva two of his team stormed out insisting they were going back to the US.

“They refused to be spoken to like that by a boy half their age. Justin was all over the place when he arrived. He’d failed to show for final sound checks earlier and knew how late he was but didn’t seem to care. He kept saying, ‘I’ll go on when I’m ready – my fans will wait’.”

Meanwhile, a Bieber fan who asked not to be named, told how the star turned up three hours late for a meet-and-greet at the 02 on Thursday.

She paid £330 to meet her idol but ended up seeing him for about 15 seconds. She said“It was really ­disappointing.”

Bieber has tried to placate his British fans on Twitter, ­calling them the “best in the world”. He is due to fly out of the UK today.